This is a portable smart fingerprint padlock, your finger is the key! This smart fingerprint padlock is built-in advanced fingerprint identification chip with high penetration, Low power consumption and long standby time, When out of battery, the fingerprint padlock will remain locked, simply connect to a USB power supply and recover. The thumbprint padlock longest standby time is up to 2 years, and the maximum number of unlocking times is up to 3000 times. This smart fingerprint padlock,no keys, no complicated APP operation, just simple fingerprint record and delete; Farewell to keys and cumbersome digital combinations. Never worry about losing your key or forgetting passwords. It only takes 0.5 second to unlock it. The smart thumbprint padlock can record up to 40 different fingerprints.